Question: Which is the {crystal system} who {discoverer or inventor} of {Titanium} ?
Paraphrase: who invented titanum and what is the crystal system?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q716 wdt:P556 ?ans_1 . wd:Q716 wdt:P61 ?ans_2 }
Answer: hexagonal crystal system, Friedrich Wöhler